一、概述二十年来,在先张法预应力构件中“去粘钢铰“线”的应用日益增长。此项技术在美国和加拿大已成功地应用于房屋建筑与桥梁工程的Π形梁、箱形梁和工形梁中。由于在梁的底部布置直线预应力钢铰线,其所产生的预应力弯矩可构成构件端部区域的应力过大,因为在该区域的静载弯曲 I. OVERVIEW Over the past two decades, the application of “debonding steel hinge” wire in pretensioned prestressed components has been steadily increasing.This technology has been successfully applied to Π-shaped beams of building construction and bridge engineering in the United States and Canada, Box girders and girders.With the placement of linear prestressing steel wire strands at the bottom of the girders, the prestressing moment they produce can constitute an over-stress in the end region of the component since the dead-load bending in this region